Gender, age, and surgical levels of ossified posterior longitudinal ligament study patients.
| Case No. | Gender | Age, y | Surgical Levels |
| 1 | Male | 66 | C2-C4 |
| 2 | Male | 66 | C2-C7 |
| 3 | Male | 54 | C3-C4 |
| 4 | Female | 62 | C3-C5 |
| 5 | Male | 58 | C3-C6 |
| 6 | Male | 74 | C3-C6 |
| 7 | Female | 76 | C3-C7 |
| 8 | Male | 50 | C3-T1 |
| 9 | Male | 72 | C4-C5 |
| 10 | Male | 44 | C4-C6 |
| 11 | Female | 74 | C4-C7 |
| 12 | Male | 42 | C5-C6 |
| 13 | Male | 54 | C5-C6 |